In his first public comments since one of his executives was shot to death, UnitedHealth Group CEO Andrew Witty said the healthcare system “needs to function better.”

In its first results since its insurance unit CEO was fatally shot in New York City, UnitedHealth Group reported Thursday weaker-than-expected fourth-quarter revenue, prompting its shares to fall in early morning trading despite quarterly profit beating projections.

UnitedHealth CEO Andrew Witty said on Thursday that healthcare in the U.S. needs to be "less confusing, less complex and less costly" during the company's first earnings call since the murder of Brian Thompson,